Primo – 25 is a mild oral anabolic with extremely low androgenic activity, meaning that there is only a minimal chance of typical steroid side-effects. It does not convert to estrogen and, therefore, estrogen-caused water retention and fat deposition will not occur from using it. Methenolone increases the conversion of protein to lean muscle tissue through its anabolic activity. Because primo – 25 has virtually no androgen (i.e., masculinizing) effects, it can generally be used safely by women.